Which of the following is a valid tagged custom campaign? Select all that apply.

2) Which of the following is a valid tagged custom campaign? Select all that apply.a) www.example.com utm_campaign=fall&utm_medium=email&utm_source=newsletter1&utm_content=a1
b) www.example.com?utm_medium=cpc&utm_source=mysearch&utm_campaign=spring&utm_term=backpacks
c) www.example.com?utm_medium=referral&utm_source=example&utm_campaign=winter
d) www.example.com?utm_medium=email&utm_source=newsletter1&utm_campaign=spring